A High Voltage Signal Sampling Circuit Based on Double Sampling Technology

Abstract

A high voltage signal sampling circuit based on double sampling technology. which includes a third sampling capacitor C S3 , the fourth sampling capacitor C S4 , fully differential transconductance amplifier S, third integrating capacitor C I3 , the fourth integral capacitor C I4 , the first switch c1, the second switch c2, the third switch c3, the fourth switch c4, the fifth switch c5, the sixth switch c6, the seventh switch c7 and the eighth switch c8. Effects and advantages of the high-voltage signal sampling circuit based on double-sampling technology provided by the present invention: the circuit uses double-sampling technology, which can effectively solve the problem that the high-voltage lithium battery voltage cannot be collected due to the lack of high-voltage capacitors in the low-voltage CMOS process, that is, it can use A low-voltage CMOS process replaces a high-voltage CMOS process, thereby reducing costs.

Description

technical field [0001] The invention belongs to the technical field of high voltage sampling, in particular to a high voltage signal sampling circuit based on double sampling technology. Background technique [0002] With the continuous improvement of people's living standards, people have higher requirements for the living environment. Therefore, in order to reduce the exhaust emissions of automobiles and reduce environmental pollution, new vehicles such as electric bicycles, electric vehicles, and scooters are more and more subject to people's attention and liking. Among them, the battery is the core part of these products, and its safety and service life have become the focus of product design. Therefore, in order to improve the service life of the battery and ensure the safety of the battery, a battery charge and discharge monitoring, management and control circuit chip has been proposed and effectively used in different electronic products. figure 1 A simple block dia...

AI Technical Summary

Problems solved by technology

It can be seen that when the switch S1 is turned on (the first battery is selected), due to the cascade connection of n batteries, the charging voltages (vinp-vcm) and (vinn-vcm) on the two sampling capacitors are relatively high, therefore, in Both sampling capacitors in the circuit need "high-voltage capacitors" to realize, but some processes do not provide "high-voltage capacitor" models, and the process of providing "high-voltage capacitors" is usually relatively expensive

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